#pragma once
#include <iostream>
#include <assert.h>
#include <unordered_map>
#include <fstream>
#include "../comm/log.hpp"
#include "../comm/util.hpp"
#include <vector>
#include <stdlib.h>
namespace model
{
    using namespace Log;
    struct Question
    {
        std::string number; // 题目编号，唯一
        std::string title;  // 题目的标题
        std::string star;   // 难度: 简单 中等 困难
        int cpu_limit;      // 题目的时间要求(S)
        int mem_limit;      // 题目的空间要去(KB)
        std::string desc;   // 题目的描述
        std::string header; // 题目预设给用户在线编辑器的代码
        std::string tail;   // 题目的测试用例，需要和header拼接，形成完整代码
    };
    const std::string question_list_path = "./questions/questions.list";
    const std::string questions_path = "./questions/";
    class Model
    {
    private:
        unordered_map<std::string, Question> questions;
    public:
        Model()
        {
            assert(LoadQuestionList(question_list_path));
        }
        ~Model()
        {
        }
        bool LoadQuestionList(const std::string &question_list)
        {
            std::ifstream in(question_list);
            if (!in.is_open())
            {
                LOG(FATAL) << " 加载题库失败,请检查是否存在题库文件" << "\n";
                return false;
            }
            std::string line;
            while (getline(in, line))
            {
                std::vector<std::string> token;
                util::StringUtil::SplitString(line, &token, " ");
                if (token.size() != 5)
                {
                    LOG(WARNING) << "加载部分题目失败, 请检查文件格式" << "\n";
                    continue;
                }
                Question q;
                q.number = token[0];
                q.title = token[1];
                q.star = token[2];
                q.cpu_limit = atoi(token[3].c_str());
                q.mem_limit = atoi(token[4].c_str());
                std::string path = questions_path;
                path += q.number;
                path += "/";
                // std::cout << path << endl;
                util::FileUtil::ReadFile(path + "desc.txt", &q.desc, true);
                util::FileUtil::ReadFile(path + "header.hpp", &q.header, true);
                util::FileUtil::ReadFile(path + "tail.hpp", &q.tail, true);
                questions.insert({q.number, q});
            }
            LOG(INFO) << "加载题库...成功!" << "\n";
            in.close();
            return true;
        }
        bool GetAllQuestions(std::vector<struct Question> *out)
        {
            if (questions.size() == 0)
            {
                LOG(ERROR) << "用户获取题库失败" << "\n";
                return false;
            }
            for (const auto &q:questions)
            {
                out->push_back(q.second);
            }
            return true; 
        }
        bool GetOneQuestion(const std::string &number, Question *q)
        {
            const auto &iter = questions.find(number);
            if (iter == questions.end())
            {
                LOG(ERROR) << "用户获取题目失败, 题目编号: " << number << "\n";
                return false;
            }
            *q = iter->second;
            return true;
        }
    };
}